Improvement in friction clutches or pulleys



' Shelburne Falls, in

and State 'of Massachusetts, have invented friction-ring,

ings.

'overhangs said arms.

. the collar F are two wedgeshaped pie UNITED .STATES PATENT @erica S.SHEPARDSON, 0F SIIELBURNE FALLS, MASSACHUSETTS.

Specifica-tion forniing parts of Letters Patent No. 43, [38, dated June14, 1864.

To all u-hom it may concern Beit known that I, H. S. SnErARDsoN, of thecounty of Franklincertain new and useful improvements in Fric-` tionClutches or Pulleys; and I do hereby declare that the following is ai'ull, clear, and exact description of the same, reference being had tothe accompanying drawings, making a parl; oi' this specieatiomin which-Figure 1 represents a side view ot the pulley or clutch, and Fig. 2represents a section through the same in the direction of the line oftheshaft on which it is to beplaced. f

Similar letters, where they occur, denote like parts in both ofthefigures.

' My invention consists, first, in the 'combi nation ot' the wedges onthe sliding collar with the radial arms on the hub ot' the clutch ringfor forcing out said clutch or friction ring against the inner perimeterof the pulley; and, secondly, it consists in the. manner ot' connectingthe radial arms tothe segmental so as to more directly apply the forceof said armste the expanding of said segments. i

To enable-others skilled in the art to make and use my invention, I'willproceed to 'describe the same with reference to the draw The hub a of`the expansive or friction ring A is fitted to the'sh'aft B by afeather, b, aud suitableslot, so that both shall turn together. The-hu'b c of the pulley C isv-fitt`ediipon and over thehub a, so as toturn independent oi'said hub a when unclutched froln its ring A. Acollar, '1),' with a setserew, r1, or otherwise, holds the pulley andits hub c in position at one end and the hub a of the frictionfring atthe other end. The arms E of the pulley areV at or near the center of.the face or perimeterV of said pulley, sothat the rim ot' the pulleyoves endwise on -the grooved ate for the shipper to rlfhis collar, b vmeans of a feather, g, can turn with the Ashaft and be the shaft at the'same time. VUpon ces, h h, openings, i1',

F is a collar that 1n shaft B, and is work in.

f, and slot slid along which work in two mortises or near the hub aofthe'expansive ring A. When ese openings, s or arms a n, which havethem, to which one end of pair `ot` toggle-arms o o is hinged, the

nds ot' said levers being hinged or pivk the wedgesare forced into ththey pass under pin cross-'heads m upon of the other e under the rim ofthe pulley,

make this clamping and u -the friction bet the pair working upondiii'erent segments,

of the levers o and thus the slightest motion clamps or releases thesegments from the drum of thepulley, as the case may be. When the wedgesh h are forced in to the position shown in red lines in Fig. 2, thesegments are'tightly clamped against the pnl-ley, so that all shall rnn.with the shaft, shown in black lines in Fig. 2, then the pulley isunclutched and can run independent et' the shaft and friction clutch,4or stop, while they continue to run.

vThe segmental-frictionring A isentirely and only moves radiallyand notalong the shaft, and thus is out of the wayand makes mechanism.A Eachsegu-lent has one arm, Gr, cast or wrought .on it to hold it in placeand prevent the `segments from moving toward the center, and thus fthelninutest expansion ofthe ends or split portions ofthe segmentsimmediately clamps itself to-the pulley,.er unclamps it, `as the casemay be 5 and to nclamping at all times perfect a nut, s, on the screw umay be adjusted so as to make it very sensitive and reliable, andinstantaneous in its action, said screw u being made on a portion of thearm n, against which the wedges l1. work. To cause the wedges h li tomorefreely move the arms n a, I propose to place small -frictionof saidarms,vto reduce Ween the two parts, withoutl rolls upon the endsimpairing the radialgforce uponfthe arms by Having thus fully describedmy invention, what claim therein as new, and Vdesire to secure byLetters Patent, isi 1. The combination of Athe wedges li on the slidingcollar F with thel radial arms n, connected with the expansive orfriction ring A, substantially 'as 'an friction-segments bytoggle'levers o o, which straddle the -cuts in said ring, as and for thepurpose described.

n. s. sHnPAnDsON. Witnesses:

' inn. PRATT,

NELsoN SPa/teun.

Vand `when in the position a. neat piece of" d for the purposedescribed. 2. Counecting the .radial arms u to the

